Caster



FIG. 1 is a perspective view of a caster according to the invention, with the peg, axle and screw nut shown in broken lines being for illustration purposes only and forming no part of the claimed design;

FIG. 2 is a rear elevational view of a caster according to the invention with the peg, axle and screw nut shown in broken lines being for illustration purposes only and forming no part of the claimed design;

FIG. 3 is a front elevational view of a caster according to the invention with the peg, axle and screw nut shown in broken lines being for illustration purposes only and forming no part of the claimed design;

FIG. 4 is a right side elevational view of a caster according to the invention with the peg, axle and screw nut shown in broken lines being for illustration purposes only and forming no part of the claimed design;

FIG. 5 is a left side elevational view of a caster according to the invention with the peg, axle and screw nut shown in broken lines being for illustration purposes only and forming no part of the claimed design;

FIG. 6 is a top plan view of a caster according to the invention with the peg, axle and screw nut shown in broken lines being for illustration purposes only and forming no part of the claimed design; and,

FIG. 7 is a bottom plan view of a caster according to the invention. 

The ornamental design for a caster, as shown and described. 